What it means
The oxygen sensor pumping current trim circuit for bank 2 sensor 1 is below the expected level.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 1 is the upstream oxygen sensor on the engine's second cylinder bank; its pumping-current trim circuit helps the module interpret the sensor's exhaust-mixture reading. P2630 sets when that trim circuit is below its expected level, potentially because the calibration resistor or its wiring is shorted or the connector has poor contact.
Common causes
Most likely first.
- Short in the calibration trim resistor
- Water intrusion in the sensor connector
- Connector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Record freeze-frame data and review Bank 2 Sensor 1 fuel-trim and oxygen-sensor data alongside any related sensor circuit codes.
- Locate the upstream Bank 2 Sensor 1 connector and inspect it for water intrusion, corrosion, damaged pins, or heat-damaged wiring.
- Check the trim-circuit wiring for a short and inspect the calibration trim resistor or sensor assembly identified by the vehicle wiring information.
- With the sensor disconnected as directed by service information, test the trim circuit and connector continuity for shorts or excessive resistance.
- Compare the trim-circuit readings and sensor response with the manufacturer's specification before condemning the sensor or module.
Common fixes
- Dry and clean the Bank 2 Sensor 1 connector and restore sound pin contact.
- Repair damaged wiring or a short in the Bank 2 Sensor 1 trim circuit.
- Replace the failed calibration trim resistor or sensor assembly if it is not serviceable separately.
- Repair the module circuit only after the sensor, resistor, connector, and wiring test correctly.
Can I keep driving?
You can usually drive gently if the engine runs normally, but a faulty upstream Bank 2 sensor can increase fuel use and emissions and may cause hesitation. Avoid prolonged driving with the warning light on, and address it before an emissions test.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.